Happy Friday, snehanair04!
I see that you just joined our T-Mobile Support Community, welcome!
I checked out the coverage in the area code you provided in San Francisco. I don't see any modernization going on in the area nor is any scheduled. What's going on with your services? I know it has been a few days since you posted so there is also a chance everything is back to normal.
Keep us posted!
Just checking in here to see how things are going. Are you still having issues with your service?